I have tried this method. The idea is that shining a light on an object with
negative diffuse actually makes it *darker*. However, it appears (This is
what the guys on the group said) that diffuse intensity is clipped at zero.
Having said that, I have rendered a model like this and (also based on
Thomas' model) I can't see the lights on the lit side of the earth, but can
on the dark side, so I call it acceptable.
"Simon" <sim### [at] surfeude> wrote in message
news:3b826f1a@news.povray.org...
> I haven't looked at the source, but I think it
> should work if you just add another sphere
> with a texture that has
>
> diffuse -light_intensity
> ambient light_intensity
> brilliance 0
>
> of course this will only work with one light source.
>
>
>

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